Rocklatan Side Effects: What to Expect and When to Call Your Doctor

Rocklatan (netarsudil/latanoprost ophthalmic solution 0.02%/0.005%) is generally well tolerated, but it does have a distinctive set of side effects — many of them visible to the eye. Because Rocklatan combines two active ingredients that each have their own side effect profiles, understanding what to expect is important for staying on your treatment and knowing when something needs medical attention.

The Most Common Side Effect: Red Eyes (Conjunctival Hyperemia)

The most common side effect of Rocklatan is conjunctival hyperemia — a medical term for red or pink eyes. In clinical trials (MERCURY 1 and MERCURY 2), 59% of patients reported this side effect. The redness is caused primarily by netarsudil's effect on episcleral veins — it dilates small blood vessels in the eye as part of how it lowers eye pressure.

Most cases are mild. About 5% of patients in clinical trials discontinued Rocklatan because of eye redness. The redness tends to be most noticeable shortly after instillation and may lessen over time in some patients. If the redness is bothersome, talk to your ophthalmologist — they can assess whether a different formulation or timing of administration might help.

Other Common Side Effects

Based on clinical trial data, the following side effects occurred in 5% or more of patients:

• Instillation site pain (20%): A stinging or burning sensation when the drop is placed in the eye. This typically lasts only seconds and usually diminishes over time.
• Corneal verticillata (15%): Small whorl-like deposits on the corneal epithelium (the surface of your eye). These are visible to your eye doctor during a slit-lamp exam but do not typically cause symptoms and do not damage vision. They usually resolve when Rocklatan is stopped.
• Conjunctival hemorrhage (11%): Small, visible broken blood vessels on the white of the eye (subconjunctival hemorrhage). These look like bright red patches but are typically painless and resolve on their own within 1–2 weeks. They occur due to netarsudil's effect on episcleral venous pressure.
• Eye itching (pruritus), blurred vision, increased tearing (5–8%): Mild and usually transient, often related to the drop's application.

Side Effects From the Latanoprost Component

Because Rocklatan contains latanoprost, it can cause the known side effects of prostaglandin analogs. These include:

• Iris pigmentation: Latanoprost can cause a gradual increase in the brown pigment in the iris. This may be most noticeable in people with mixed-color irises (e.g., green-hazel or blue-brown). This change is likely to be permanent — it typically does not reverse even after stopping the medication.
• Eyelash changes: Rocklatan may cause eyelashes to become longer, thicker, darker, or to grow in unusual directions. These changes are usually reversible when Rocklatan is discontinued.
• Periorbital skin darkening: Darkening of the eyelid skin around the eye has been reported with latanoprost-containing products. This may reverse after stopping treatment.

Serious Side Effects: What to Watch For

The following side effects are less common but warrant prompt medical attention:

• Epithelial corneal edema: Swelling of the corneal surface, which can appear as a honeycomb or blister pattern. This is more likely in patients who already have corneal stromal edema or have had certain ocular procedures. Symptoms include blurred or hazy vision. Call your doctor immediately if you experience vision changes.
• Macular edema: Fluid buildup in the macula (central retina) can occur, particularly in patients who are aphakic (no natural lens) or pseudophakic with a compromised posterior capsule. Symptoms include central vision blurring or distortion. This requires prompt evaluation.
• Uveitis flare: Rocklatan should be used with caution in patients with a history of uveitis or iritis. Symptoms of a flare include eye pain, photosensitivity, and blurred vision.
• Severe eye pain or sudden vision loss: Any acute eye pain or sudden change in vision is a medical emergency. Stop the medication and contact your doctor or go to an emergency eye care center immediately.

Preservative Note: Benzalkonium Chloride

Rocklatan contains benzalkonium chloride (BAK) as a preservative. BAK can be absorbed by soft contact lenses, which is why you must remove contact lenses before applying Rocklatan and wait at least 15 minutes before reinserting them. Long-term exposure to BAK has also been associated with ocular surface irritation in some patients. If you experience persistent dryness or irritation, discuss this with your ophthalmologist.

Systemic Side Effects

Rocklatan has minimal systemic absorption. The amounts of netarsudil and latanoprost that enter the bloodstream after a single eye drop are very small and below the threshold for systemic effects in most patients. Unlike beta-blocker eye drops (e.g., timolol), Rocklatan does not affect heart rate, blood pressure, or breathing. This makes it a favorable option for patients with cardiac or pulmonary conditions.

Related Articles

For information on drug interactions with Rocklatan, see Rocklatan Drug Interactions. For a full overview of the medication, read What Is Rocklatan? Uses, Dosage, and What You Need to Know.